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The changes of the concentrations of thiamin and riboflavin in milk enriched with prebiotics and probiotics
2006
Beitane, I. | Ciprovica, I.
Fermentation of milk with probiotics and prebiotics has been shown to increase the concentration of B group vitamins in fermented milk products. The task of the study was to investigate the influence of prebiotics on the increasing of thiamin and riboflavin concentrations in milk during fermentation by Bifidobacterium lactis. Lactulose (Duphilac, Netherlands) and inulin (Raftiline, Belgium) were added (1, 2, 3, 4 and 5%) into 100 g of milk. The milk samples were inoculated with Bifidobacterium lactis (BB-12, Chr. Hansen, Denmark) and incubated at 38 deg C for 16 hours. The amount of thiamine and riboflavin was determined by fluorometric method. Laboratory studies have shown that the increasing of thiamin and riboflavin concentrations in milk depends on the concentration of lactulose and inulin. Data on the final thiamin and riboflavin concentrations in fermented milk indicates that increasing the lactulose concentration from 1% to 3% enhanced the production of thiamin and riboflavin. The similar data was obtained with inulin. Increasing of inulin concentration from 1% to 4% enhanced the production of vitamins thiamin and riboflavin. The present results furthermore indicate that finding optimal combination of prebiotics and probiotic pairs where the prebiotic would benefit the specific probiotic strain, e.g. during production and formulation into foods, is one of the research priority for functional foods.
显示更多 [+] 显示较少 [-]Fortified wheat grains with microelement selenium
2006
Duma, M. | Karklina, D.
Selenium (Se) is an essential microelement for human health; it is not synthesized in human body and cannot be substituted by any other element. Many health problems have a link with Se deficiency. People need to obtain all necessary amounts of selenium with food. Cereal products are important components of our diets and can contribute comparatively large part of the total dietary intake of Se. The wheat grains growing in Latvia contain comparatively small amount of selenium - on average 0.04 mg kgE-1. The objective of this study was to investigate the possibilities of fortifying wheat grains with microelement selenium during soaking grains in selenium containing solutions. Wheat grain was soaked in sodium selenite and sodium selenate solutions with selenium concentration from 10 to 200 mg lE-1. Sprouting activity was determined after 24, 72 and 120 hours, the influence of selenium valence in compound was observed. Comparing the influence of Se**+4 and Se**+6, it can be concluded that Se**+4 does not promote sprouting activity of wheat grains position to Se**+6 which increases sprouting activity till selenium concentration 100 mg lE-1. Uptake of selenium in grains was studied by determination of total Se using atomic absorption spectroscopy method. Linear correlation between Se concentrations in applied soaking solutions and Se concentration in grains was observed. The content of total protein did not change significantly - it varied from 13.64% in the control sample to 13.87% in the wheat sample with the highest applied selenium concentration (200 mg lE-1).
显示更多 [+] 显示较少 [-]Antiradical activity of vegetable oils
2006
Vucane, S.
This research presents the antiradical activity and fatty acids changes of vegetable oils. Natural antiradical activity and its changes during storage for one and two years of rapeseed, linseed and hemp oils were determined with 1.1-diphenyl-2-picrylhydrazyl (DPPH). Fresh hemp oil shows the higher antiradical activity. The content of fatty acids of fresh rapeseed, linseed and hemp oils and of the mixture of rapeseed (800 g kgE-1) and linseed (200 g kgE-1) oils was determined by the method of gas chromatography. After heating the mixture of rapeseed and linseed oils at the temperature of 160-180 deg C, changes proportions in saturated and unsaturated fatty acids.
显示更多 [+] 显示较少 [-]Fungi in mink feed and organs
2006
Valdovska, A. | Jemeljanovs, A. | Pilmane, M.
The research of feed components of minks (frozen fish and meat offal, dried haemoglobin, dried protein, wheat, barley, wheat and barley meal), and ready-mixed mink feed were investigated by mycological method in Sabouraud's Agar and Czapek Agar. The mycological examination of mink feedstuffs veriffed its contamination with Acremoniella atra, Alternaria spp., Aspergillus spp., Aureobasidium pullulans, Candida spp., Chaetomium spp., Cladosporium spp., Coremiella cubispora, Crysonilia sitophila, Curvularia spp., Fusarium spp., Gliocladium spp., Moniliella acetoabutans, Mortierella spp., Mucor spp., Penicillium spp., Sporothrix cyanescens, Stemphylium spp., Trichophyton terrestre, Zygosporium masonii, and Wangiella spp. Mycological examination of the mink liver, lungs and kidneys showed contamination with Acremonium spp., Actinomyces israelli, Arthrographis kalrae, Aspergillus spp., Aureobasidium pullulans, Candida spp., Chaetomium spp., Cladosporium bantianum, Cladosporium sphaerospermum, Conidiobolus coronatus, Curvularia spp., Emmonsia spp., Fonsecaea pedrosoi, Geotrichum candidum, Mucor spp., Penicillium spp., Scedosporium prolificans, Sporothrix cyanescens, and Wangiella spp.
显示更多 [+] 显示较少 [-]Forest clear-cut mapping in Latvian and Estonian boundary area with Landsat Thematic Mapper satellite images
2006
Budenkova, J.
The most obvious application of satellite images in forestry areas and generating forests maps with particular emphasis on identifying temporarily non-forested areas and mapping forest clear-cuts. The aim of this paper was to investigate the influence of attributes describing forest clear-cut patch size, patch shape, and habitat conditions on classification results and map forest clear-cuts in Latvian and Estonian boundary area. The satellite images used were medium spatial resolution Landsat Thematic Mapper satellite images made in plain snow cover conditions in late winter. The boundary area was represented by Aluksne region in Latvia and by Voru County in Estonia. Clear -cut areas as changed areas in forests were discerned from non-changed areas with image differencing method that has proved itself as one of the most often used methods in land use and land cover change detection.
显示更多 [+] 显示较少 [-]Change of forest land use - problems, losses, values
2006
Bara, G.
Forests and possibilities for forest land use have always played a very significant role in Latvia, gathering important experience in the course of time that can be analysed and used to improve the existing laws and regulations on the basis of the acquired results. the territory is characterised by a high percentage of forest coverage and its potential to increase up two thirds of the terrestrial area of the country. In the current economic, social and ecological situation it is important to provide a scientific explanation for the future fluctuations of forest resources balance due to natural and artificial transformation of lands - what is discussed in this article?
显示更多 [+] 显示较少 [-]Initial research of strength of the wooden pallets
2006
Spulle, U. | Oss, J. | Pusinskis, V.
The manufacture and export of pallets is one of the largest sectors of the wood industry. For the manufacturing of pallets mainly softwood - spruce (Picea abies L. Karst.) and pine (Pinus sylvestris L.) wood - materials are used. The price of those materials is increasing. It could be better for the production of pallets if the manufacturers could use hardwood - alder (Alnus incana L. Moench) and aspen (Populus tremula L.) wood materials. The reasons for that could be that these materials are not so expensive and that softwood materials could be used more in the wood industry where it is more necessary. But at that point more information about the physical and mechanical properties of hardwood materials needed. Basing on the previous research on quality and mechanical properties of softwood and hardwood and on the present research work the practical and theoretical values of deflection and strength of pallets have been assessed. The research enables us to optimize the preparation for pallet production. The aim of the research is to find out the strength of the pallets without destroying.
显示更多 [+] 显示较少 [-]Environment of rural school as promoter of pupils' needs for further education
2006
Penke, D. | Katane, I.
The school's education surrounding is the places where social experience and children's learning opinion are gathered develop the system of attitudes. It values actualizes education's needs and develop the motivation of self-realization and develop motivates to continue the education. It is important to develop the skills to make a prognosis, to plan and to project the future. The aim motivation must be the real key in this process. The education of career is the school especially the main thing for rural schools that provide the long-term development during the crisis of demography and competition. The authors offer: 1) the typical needs of pupils for education in the surrounding of education, which is based on ecological approach in education and stresses the link between the surrounding and man in the holistic way, 2) the analysis of done investigations and evaluation in the part of discussions analysing the approach of career's education problems in the rural school, giving the references to other authors' views and investigations.
显示更多 [+] 显示较少 [-]Variation in endosperm beta-glucan content of different spring barley genotypes
2006
Bleidere, M
Grain samples of 51 spring barley (Hordeum vulgare L.) genotypes, including two-row, six rows, covered and hull-less were used for investigation of endosperm beta-glucan content. A significant difference (p-value is less than 0.001) between genotypes in beta-glucan content was observed. On average, the six-row barleys had slightly higher beta-glucan content. Far six-row genotypes it ranged from 35.9 to 47.1 mg kgE-1 with the mean value of 41.4 mg kgE-1, but for tw0-row barleys - 38.0 mg kgE-1 within the range of 33.2-44.9 g kgE-1. Six-row genotypes had a higher coefficient of variation in comparison with two-row genotypes. Hull-less genotypes had significantly higher beta-glucan content than the covered ones (49.3 mg kgE-1 and 38.9 mg kgE-1 respectively). The standard deviation of the mean values of beta-glucan content for covered genotypes was lower than for the hull-less ones. The mean values in 2005 were well plotted against data from the previous season for genotypes included in the two years trial. There were two distinct clusters of covered and hull-less genotypes. Beta-glucan content for varieties bred in Latvia ranged from 33.2 mg kgE-1 for two-row variety 'Malva' to 46.0 mg kgE-1 for six-row variety 'Druvis'.
显示更多 [+] 显示较少 [-]The importance of aquaculture in the South-Eastern Anatolia Project in Turkey
2006
Canyurt, M.A.
The South-Esatern Anatolia Project (GAP) is a multi-sector and integrated regional development project in Turkey. The project area covers 9 administrative provinces - Adiyaman, Batman, Diyarbakir, Gaziantep, Kilis, Mardin, Siirt, Sanliurfa, and Simak - in the basins of the Euphrates and Tigris. The GAP planned in the 1970s consists of projects for irrigation and hydraulic energy production on the Euphrates and Tigris rivers. The development program encompasses such sectors as irrigation, hydraulic energy, agriculture, fish farming, rural and urban infrastructure, forestry, education, and health. This project envisages the construction of 22 dams and 19 hydraulic power plants and irrigation of 1.7 million hectares of land. The total cost of the project is estimated as US $ 32 billion. The construction of several dams will cause an increase in total capacity of more than 600 000 tons of fish in the region. Aquaculture will be an important source of income for the people and the economy of the country, a sum of US $ 1.8 billion of income will be obtained each year.
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